Comparative evaluation of negative lymph node count, positive lymph node count, and lymph node ratio in prognostication of survival following completely resection for non-small cell lung cancer: a multicenter population-based analysis - Huang, Qiming; Chen, Shai; Xiao, Yuanyuan; Chen, Wei; He, Shancheng; Xie, Baochang; Zhao, Wenqi; Xu, Yuhui; Luo, Guiping (Frontiers in Surgery, 2024)